AFAIK, libmp4v2 is a library for (de)multiplexing MP4 (MPEG-4 Part 14) files.
While various video formats may be stored in an MP4 container (such as MPEG-4 ASP or MPEG-4 AVC aka H.264), libmp4v2 does not provide any video encoding or decoding functions by itself.
x264, for example, can encode video to the AVC/H.264 format and it is able to output the result in an MP4 container right away...
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